The number of trading days considered in the arrangement.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost capitalized for award under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of vesting of award under share-based payment arrangement.

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Stockholders' Equity - Restricted stock (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended		6 Months Ended
	Apr. 30, 2020	Mar. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense			$ 3.3	$ 0.2	$ 5.5	$ 5.4
Single Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares	20,656	300,000
Vesting percentage	33.00%	25.00%
Grant date fair value	$ 0.3	$ 4.9
Number of trading days	10 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, shares	20,656	300,000
Various Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares		341,123	78,536
Vesting period			4 years
Grant date fair value		$ 5.6	$ 1.3
Equity-based compensation expense		0.3
Compensation cost, portion to be recognized over service period		$ 5.3
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, shares		341,123	78,536
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares					740,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested balance at beginning of period					901,000
Granted, shares					740,000
Vested, shares					(20,000)
Forfeited, shares					(20,000)
Non-vested balance at end of period			1,601,000		1,601,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Non-vested, grant date fair value at beginning of period					$ 5.83
Granted, grant date fair value					16.22
Vested, grant date fair value					14.33
Forfeited, grant date fair value					8.11
Non-vested, grant date fair value at end of period			$ 10.49		$ 10.49
Tranche 1 \| Single Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares		250,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, shares		250,000
Tranche 1 \| Various Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares		15,417
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, shares		15,417
Tranche 2 \| Single Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares		50,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, shares		50,000
Tranche 2 \| Various Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		25.00%